- avoid conflict with colordiff

- updated to version 1.1.4
* Easier access to color attributes via color(123) or
approximate html colors like color('#336caf').
* Fix a bug where respond_to could overflow the stack.
* Change the API: color0 - color255 to color(:color0) -
color(:color255), and on_color0 to on_color(:color0) -
on_color(:color255); the previous way caused some
failures, sorry. On the plus side you can now do
color('#4a6ab4') and get the nearest terminal color to
this html color.
* Add colortab executable to display the 255 colors and
related HTML colors.